BEAUTY AND PLAY
ABOUT times Print the accumulated user and system times for the shell and for processes run from the shell [bash] $times 0m0.063s 0m0.024s 0m0.008s 0m0.012s $times pin 0m0.064s 0m0.025s 0m0.008s 0m0.012s $times ping 0m0.065s 0m0.025s 0m0.008s 0m0.012s $times –help times: times Display process times. Prints the accumulated user and system times for the shell and …
Continue reading “Sessions of bash builtin command named “times””
ABOUT eval eval is a builtin command of the Bash shell. It concatenates its arguments into a single string, joining the arguments with spaces, then executes that string as a bash command. It’s similar to running bash -c “string”, but eval executes the command in the current shell environment rather than creating a child shell …
TYPICAL COMMANDLINE SESSION [bash] $echo $? 0 $echo $? 0 $exit 10 | tee solve.txt $cat solve.txt $rm solve.txt $exit 10 | echo $? 0 $exit -1 | echo $? 0 $exit -1 | echo $? 0 $false | true $echo $? 0 $false $echo $? 1 $true $echo $? 0 $exit 5 | tee …
this tutorial content may not be accurate [youtube https://www.youtube.com/watch?v=E-SPhtL-jTM?rel=0&w=560&h=315]
commandline session $ls faq favicon.ico index.html kernel.css mirrors pub robots.txt $file kernel.css kernel.css: ASCII text $file -l | head Set 0: Binary patterns: Text patterns: Set 1: Binary patterns: Text patterns: Set 0: Binary patterns: Strength = 340 : sc68 Atari ST music [] Strength = 340 : T64 tape Image [] $file -l | …
A UNIX Command $cat hello.pl # Prints the message using two different delimeters. print “Hello, world!\n”; print qq=Did you say “Hello?”\n=; $perl hello.pl Hello, world! Did you say “Hello?” $ UNIX Explanation “print” is categorized under Input/Output Functions. Prints the message using two different delimeters. source : http://sandbox.mc.edu/~bennet/perl/leccode/index.html
A UNIX Command $cat example.text hello $ls -l example.text -rw-r–r– 1 jeffrin jeffrin 6 Jun 21 02:32 example.text $truncate -s 10 example.text $ls -l example.text -rw-r–r– 1 jeffrin jeffrin 10 Jun 21 02:35 example.text $hexdump example.text 0000000 6568 6c6c 0a6f 0000 0000 000000a $cat example.text hello $truncate -s 9 example.text $ls -l example.text -rw-r–r– 1 …
Continue reading “truncate – shrink or extend the size of a file to the specified size”
$cat 1 $ $cat 2 $ $find . ./2 ./1 $find . . ./2 ./1 $ls 1 2 $find . -print . ./2 ./1 $find -print . ./2 ./1 $find -name 1 ./1 $ The find command is used to locate files on a Unix or Linux system. find will search any set of director- …
MySQL tinkering mysql> create database jeffdatabase -> ; Query OK, 1 row affected (0.03 sec) mysql> show databases; +——————–+ | Database | +——————–+ | information_schema | | jeffdatabase | | mysql | +——————–+ 3 rows in set (0.00 sec) mysql> use jeffdatabase Database changed mysql> show tables; Empty set (0.00 sec) mysql> create table songs …
addition #!/usr/bin/php # Author : Jeffrin # jeffrin@rocketmail.com # License GNU GPL V3 # usage : php addition.php <?php $f=’1′; $s=’1′; echo $f + $s ; echo “\n”; ?> A Screenshot $./addition.php # Author : Jeffrin # jeffrin@rocketmail.com # License GNU GPL V3 # usage : php addition.php 2 $